Author: H. M. Gerstenberg
Publisher:
ISBN:
Category : Neutron counters
Languages : en
Pages : 52
Book Description
The response to various neutron spectra of a 2-inch diameter BF3 proportional counter in a Halpern-type geometry has been studied as a function of moderator thickness. Neutron sources used were a calibrated RaDBe(a,n) source and a series of photoneutron sources using a number of bremsstrahlung spectra. The reactions used were: 16PO(gamma,n), 31P(gamma,n) and d(gamma,n). For these sources absolute neutron yields were determined either from the residual B+ activity or from the known cross section and the absolute bremsstrahlung intensity. Using these empirical data a final detector with 13 BF3 counters was constructed. Over the spectral range covered by the above sources the measured efficiency for counting neutrons of the final detector was 9.6 percent with an estimated uncertainty of plus or minus 0.5 percent, independent of spectrum. The detector was used to measure the neutron yields from Pb, Au, Ta, Ho, Ag, Cu, Co, Ca, P, Al, O and C for a series of bremsstrahlung energies between 12.0 and 29.0 MeV. These yields were compared with those calculated from previously published neutron yield cross sections. The data indicate that previously reported discrepancies in neutron yield data can probably be traced to the determination of neutron detector efficiencies. (Author).
Study of a Halpern-type 4[pi] Neutron Detector
Author: H. M. Gerstenberg
Publisher:
ISBN:
Category : Neutron counters
Languages : en
Pages : 52
Book Description
The response to various neutron spectra of a 2-inch diameter BF3 proportional counter in a Halpern-type geometry has been studied as a function of moderator thickness. Neutron sources used were a calibrated RaDBe(a,n) source and a series of photoneutron sources using a number of bremsstrahlung spectra. The reactions used were: 16PO(gamma,n), 31P(gamma,n) and d(gamma,n). For these sources absolute neutron yields were determined either from the residual B+ activity or from the known cross section and the absolute bremsstrahlung intensity. Using these empirical data a final detector with 13 BF3 counters was constructed. Over the spectral range covered by the above sources the measured efficiency for counting neutrons of the final detector was 9.6 percent with an estimated uncertainty of plus or minus 0.5 percent, independent of spectrum. The detector was used to measure the neutron yields from Pb, Au, Ta, Ho, Ag, Cu, Co, Ca, P, Al, O and C for a series of bremsstrahlung energies between 12.0 and 29.0 MeV. These yields were compared with those calculated from previously published neutron yield cross sections. The data indicate that previously reported discrepancies in neutron yield data can probably be traced to the determination of neutron detector efficiencies. (Author).
Publisher:
ISBN:
Category : Neutron counters
Languages : en
Pages : 52
Book Description
The response to various neutron spectra of a 2-inch diameter BF3 proportional counter in a Halpern-type geometry has been studied as a function of moderator thickness. Neutron sources used were a calibrated RaDBe(a,n) source and a series of photoneutron sources using a number of bremsstrahlung spectra. The reactions used were: 16PO(gamma,n), 31P(gamma,n) and d(gamma,n). For these sources absolute neutron yields were determined either from the residual B+ activity or from the known cross section and the absolute bremsstrahlung intensity. Using these empirical data a final detector with 13 BF3 counters was constructed. Over the spectral range covered by the above sources the measured efficiency for counting neutrons of the final detector was 9.6 percent with an estimated uncertainty of plus or minus 0.5 percent, independent of spectrum. The detector was used to measure the neutron yields from Pb, Au, Ta, Ho, Ag, Cu, Co, Ca, P, Al, O and C for a series of bremsstrahlung energies between 12.0 and 29.0 MeV. These yields were compared with those calculated from previously published neutron yield cross sections. The data indicate that previously reported discrepancies in neutron yield data can probably be traced to the determination of neutron detector efficiencies. (Author).
Government-wide Index to Federal Research & Development Reports
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1470
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1470
Book Description
Publications
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 788
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 788
Book Description
Publications of the National Bureau of Standards, 1966-1967
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category :
Languages : en
Pages : 228
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 228
Book Description
Catalog of National Bureau of Standards Publications, 1966-1976
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 804
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 804
Book Description
Catalog of National Bureau of Standards Publications, 1966-1976: pt. 1 Citations and abstracts. v. 2. pt. 1. Key word index (A through L). v. 2. pt. 2. Key word index (M through Z)
Author: United States. National Bureau of Standards. Technical Information and Publications Division
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 804
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 804
Book Description
NBS Special Publication
Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 858
Book Description
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 858
Book Description
Annual Report of the National Bureau of Standards
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 1048
Book Description
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 1048
Book Description
Masters Theses and Doctoral Dissertations in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States
Author:
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 512
Book Description
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages : 512
Book Description
Master's Theses and Doctoral Dissertations in the Pure and Applied Sciences
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 170
Book Description
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 170
Book Description